.head {
    width: 100vw;
    height: 45px;
    background: #ccc;
}

.dibu {
    width: 100vw;
    height: 100px;
    background: #ccc;
}

.dibu div {
    width: 100%;
    height: 50%;
    text-align: center;
}

.dibu div button {
    width: 90%;
    height: 80%;
    background: #fff;
    border: none;
    border-radius: 10px;
    margin: 5px auto;
    font-size: 20px;
    color: #00f;
    font-weight: 400;
    border: 1px solid #00f;
}